How to Block Unc0ver Jailbreak Tool in iOS apps

Last updated May 18, 2021 by Alan Bavosa

Learn the 3 easy steps to Block Unc0ver Jailbreak Tool in iOS apps, to prevent hackers from Jailbreaking iOS apps.

What is Unc0ver?

Unc0ver is a jailbreak tool used to take control over the iOS operating system (ie: to Jailbreak iOS). Unc0ver is a ‘semi-tethered’ jailbreak tool, in that it allows for the iOS device to reboot on its own. On each boot, the iOS device startup sequence is modified and is booted into its original, non-jailbroken state. If the owner wishes to jailbreak their device again, they can do so with the help of an app running on the iOS device.

Semi-tethered Jailbreak tools (i.e. Checkra1n) will be installed using a computer attached via USB to the iDevice. These tools usually come with on-screen prompts to guide the user through the various steps (like which buttons to press, based on the specific iDevice type) to reach the “Device Firmware Update” mode (DFU), which is required in order to execute the jailbreak.

What is iOS Jailbreaking?

Jailbreaking is the process of unlocking the iOS operating system on an Apple mobile device. Jailbreaking is a form of administrative privilege escalation, which bypasses Apple’s restrictions, resulting in full administrative control over the OS (the highest level of administrative privilege possible).  Jailbreaking is often accomplished by exploiting bugs in Apple’s software/firmware or modifying system kernels to allow read and write access to the file system. Jailbreaking is one of the primary methods/tools for every hacker – both black hat hackers and white hat hackers (eg: penetration testers or security researchers). They all use Jailbreaking in similar ways (to compromise the security model of mobile devices, the operating system, and any app running on the device). The main difference is that black hat hackers have malicious intent, while white-hat hackers generally have non-malicious intent.

Here are the Top 3 reasons people use Unc0ver to Jailbreak iOS/ iPhones

  1. To bypass Apple’s restrictions and install software Apple doesn’t support or sanction.
  2. To change the behavior of the OS in ways that Apple does not support
  3. Gamers or hackers Jailbreak iOS to access alternative app stores like Cydia, where they can obtain lots of apps designed to take advantage of the new administrative capabilities – such as mods, tweaks, cheat tools, and more advanced hacking tools.

Whatever the intent, Jailbreaking makes every hacker’s job much easier by providing a significant advantage to compromise the security model, due to the elevated level of privilege and full administrative control that Jailbreaking enables. Jailbreaking makes it easier to disable anti-tampering protections, to disable security protections, to make changes to the iOS file system, to change properties files, bundle ID’s or other app attributes (eg: hackers sometimes jailbreak iPhones to bypass in-app purchases, or for hacking info.plist to turn off mobile advertisements inside the app, just to name a couple of examples).

Net net: Jailbreaking compromises the mobile security model. Any iOS app that runs on a Jailbroken device is in a vulnerable state, where hackers can amplify and increase the magnitude of their attacks. And when iOS apps run on Jailbroken devices, you really can’t trust any of the signals, messages, or behaviors associated with the device (or anything running on the device).

Keep reading to learn how to use Appdome Jailbreak Prevention to protect any iOS app against Unc0ver and many other Jailbreaking tools.

How to Block Unc0ver Jailbreak Tool in iOS apps

Appdome Jailbreak Prevention enables an iOS app to protect itself against Jailbreaking and Jailbreaking tools like Unc0ver. You can use Appdome to build Jailbreak Prevention into any iOS app – without coding. When the Appdome-secured app detects that it’s running on a Jailbroken device the app will shut itself down (default behavior) after displaying a message to the mobile user. This protects that app, user, and mobile data from being compromised or attacked by a malicious actor using Jailbreaking.

3 Easy Steps to Block Unc0ver 

Please follow these 3 easy steps to Block Unc0ver in any iOS app to prevent hackers from compromising the app’s security model. 

  1. Upload an iOS App to Appdome’s no code security platform (.ipa)
  2. In the Build Tab, under Security, Select Jailbreak Prevention (shown below)
  3. Click Build My App

No code jailbreak prevention ios apps

Congratulations! The app can now defend itself against Jailbreaking and Jailbreaking tools like Unc0ver.

Appdome’s no-code mobile app security platform offers mobile developers, DevSec and security professionals a convenient and reliable way to protect Android and iOS apps with RASP (Runtime Application Self-Protection), such as Jailbreak Prevention. When an Appdome user clicks “Build My App,” Appdome leverages a microservice architecture filled with 1000s of security plugins, and an adaptive code generation engine that matches the correct required plugins to the development environment, frameworks, and methods in each app.


Here’s what you need to build secured apps with

No Coding Dependency

Using Appdome, there are no development or coding prerequisites to build secured apps with Jailbreak prevention and prevent Unc0ver. There is no SDK and no library to manually code or implement in the app. The Appdome technology adds the relevant standards, frameworks, and logic to the app automatically, with no manual development work at all.

How to Sign & Publish Secured Mobile Apps Built on Appdome  

After successfully securing your app using Appdome, there are several available options to complete your project, depending on your app lifecycle or workflow. These include 

Or, see this quick reference Releasing Secured Android & iOS Apps built on Appdome. 

 How to Learn More

Check out the following related KB articles:

Jailbreaking Prevention

Rooting Android 

Prevent Jailbreak Bypass and Jailbreak Hiding 

Check out the full menu of features in the Appdome Mobile Security Suite

If you have any questions, please send them our way at or via the chat window on the Appdome platform.

Or request a demo at any time.

Thank you!

Thanks for visiting Appdome! Our mission is to secure every app on the planet by making mobile app security easy. We hope we’re living up to the mission with your project. If you don’t already have an account, you can sign up for free.




Have a question?

Ask an expert

AnanyaMaking your security project a success!